Reconciliations of Changes in Benefit Obligations, Plan Assets and Funded Status (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at end of period	$ 1,666	$ 1,691
United States Pension Plan of US Entity [Member]
Reconciliation of benefit obligation [Roll Forward]:
Obligation at beginning of period	1,805	2,061
Interest cost	80	74	85
Service cost
Actuarial (gain) loss	212	(200)
Benefit payments	(124)	(130)
New plans
Settlements	(133)
Other	(17)
Translation adjustments
Obligation at end of period	1,823	1,805	2,061
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	1,649	1,734
Actual return on plan assets	230	5
Employer contributions		40
Benefit payments	(124)	(130)
Settlements	(133)
Translation adjustments
Fair value at end of period	1,622	1,649	1,734
Funded status at end of period	(201)	(156)
Foreign Pension Plan [Member]
Reconciliation of benefit obligation [Roll Forward]:
Obligation at beginning of period	313	309
Interest cost	11	11	12
Service cost	6	6	5
Actuarial (gain) loss	54	(1)
Benefit payments	(16)	(15)
New plans	16
Settlements	(7)	(2)
Other	(11)
Translation adjustments	(41)	5
Obligation at end of period	325	313	309
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	42	42
Actual return on plan assets	2	1
Employer contributions	16	17
Benefit payments	(16)	(15)
Settlements	(7)	(2)
New plans	18
Asset reversion	(6)
Translation adjustments	(5)	(1)
Fair value at end of period	44	42	42
Funded status at end of period	(281)	(271)
Foreign Postretirement Benefit Plan [Member]
Reconciliation of benefit obligation [Roll Forward]:
Obligation at beginning of period	112	132
Interest cost	5	5	5
Service cost	1	1	1
Actuarial (gain) loss	10	(12)
Benefit payments	(6)	(6)
New plans
Settlements
Other
Translation adjustments	(12)	(8)
Obligation at end of period	110	112	132
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	0	0
Actual return on plan assets
Employer contributions	6	6
Benefit payments	(6)	(6)
Settlements
Translation adjustments
Fair value at end of period	0	0	0
Funded status at end of period	$ (110)	$ (112)

Defined Benefit Plan Asset Reversion

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Amount of increase in plan assets attributed to a new plan.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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-Glossary Projected Benefit Obligation

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-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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-Glossary Postretirement Benefits

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The increase in the fair value of plan assets from contributions made by the employer.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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The amount that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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